A 25-year-old ex-OpenAI researcher just bet $400M on chipmaking after losing half his fund

Leopold Aschenbrenner isn’t retreating — he’s reloading. The 25-year-old founder of AI hedge fund Situational Awareness just poured $400 million into Source Foundry, a Stanford-born startup trying to make semiconductor manufacturing faster and cheaper. The Wall Street Journal broke the news this week, noting the new injection brings SA’s total stake in the company to $500 million. That’s a massive conviction bet from a fund that, by all appearances, has been on the ropes.

And it has been. At the end of July, Aschenbrenner sold off the majority of SA’s public portfolio to Ken Griffin’s Citadel after steep losses tied to the AI infrastructure stock decline. Assets under management reportedly halved — from $20 billion to $10 billion. The fund held onto its Anthropic shares, but the fire sale looked like a capitulation moment. Most managers would be in triage mode. Aschenbrenner apparently spent part of that window getting married and wiring a nine-figure check to a chip startup.

Source Foundry sits at an interesting intersection. It’s not chasing the glamorous AI model layer or even the GPU cloud. It’s attacking the unsexy, brutally hard problem of making chip fabrication less expensive — precisely the kind of bottleneck play that could matter if the AI buildout continues. Whether SA’s timing is brilliant or disastrous hinges on a question the market hasn’t answered yet: is the AI infrastructure pullback a reset or a reckoning?

Aschenbrenner has no traditional finance background. He was a researcher at OpenAI before launching the fund in 2024, and his early returns reportedly justified the audacity. The recent drawdown tests whether his research instincts translate to portfolio management. Doubling down on a single private hardware startup while selling public positions to Citadel isn’t hedging — it’s a statement. The kind that either looks prophetic or gets taught as a cautionary case study.